在发育过程中细胞核的全能性()。
A. 逐渐变窄
B. 保持不变
C. 逐渐增强
D. 不确定
E. 先变窄，再逐渐增强
根据录音，选择合适的答案（） 查看材料
A. He doesn"t know what he likes．
B. He hasn"t made the f"mal decision yet．
C. He needs advice from the admissions counselor．
D. He wants to change his major in his first year．
根据录音，选择合适的答案（） 查看材料
A. Get a visa．
Buy a plane ticket．
C. Register for classes．
D. Pack his things．
根据录音，选择合适的答案（） 查看材料
A. They can save money on transportation．
B. They will be free to go anywhere．
C. They can take their luggage in car．
D. They can drive all over
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